Wrench.



G. W. GRUVER.

WRENCH. APPLICATION FILED MAR. 22, 1910.

Patented Jan. 31, 1911.

GEORGE WASHINGTON GRUVER, 0F MONTEREY, CALIFORNIA.

WRENCH.

To all whom it may concern:

Be it known that I, GnoRGE W. GRUVER, a citizen of the United States,residing at Monterey, in the county of Monterey and State of California,have invented a new and useful Wrench, of which the following is aspecification. v

It is the object of the present invention to provide an improved pipewrench which will be extremely simple in its general construction,highly eilicient in action, and not liable to break under strain.

Primarily, the invention aims to so construct the wrench that it willgrip the pipe being turned, with a degree or" firmness in proportion tothe force to be exerted upon it, and further to so construct this meansthat it will enable the wrench to be employed in connection with pipesof various sizes to which the wrench could not otherwise be applied. Inother words, the wrench is of that type embodying a V-shaped jaw and achain adapted to engage about the pipe to be turned which chain isadapted to have its links engaged interchangeably with a projection uponthe body of the wrench and in which the engagement of one link of thechain with the projection might render the space between the chain andthe jaw too small to receive the pipe and the engage ment of the nextadjacent link might render it too large for such reception. The meansabove mentioned provides for automatic adjustmentbetween these twoextremes.

In the accompanying drawings,Figure 1 is a side view, partly brokenaway, of a wrench constructed in accordance with the present invention,the said figure illustrating in full lines the positions assumed by thevarious parts when the Wrench. is to be used to turn a pipe in onedirection and in dotted lines, the positions assumed when the pipe isturned-in the opposite direction. Fig. 2 is a sectional view on the line2-2 of Fig. 1.

In the drawings, the wrench is illustrated as embodying a stock, whichis indicated by the numeral 5, and disposed against the opposite facesof the stock at this end are cheek plates 7. A securing bolt 9 is passedthrough the said cheek plates and the said end of the stock, and servesto secure the cheek plates upon the stock with their portions which liebeyond the end of the stock, in parallel planes. As will be observedfrom inspection of Fig. 1 of the drawings, the

outer end portions of the plates are formed Specification of LettersPatent.

Application filed March 22, 1910.

Patented Jan. 31, 1911. Serial No. 550,884.

with angularly disposed jaws, which are indicated by the numeral 11 andare serrated, as at 12.

A block 12 is fitted between the cheek plates 7 and is formed with slots13 which are two in number and diverge in the direction of the inner endof the block. Pins 14 are engaged at their ends in openings in the saidcheek plates and engage one through each of the slots in the said block,it being understood that the said block is in this manner held betweenthe cheek plates for limited movement. The block is formed with aprojecting lug 15, and to this lug is connected one end of a chain ofthe sprocket type, the links 01: the chain being indicated by thenumeral 16. The stock 5 is formed at its rabbeted end at each lateraledge with a tooth, indicated by the numeral 17, the said teethprojecting directly laterally from the said edges and being slightlycurved in the manner of a hook. These teeth 17 are of such dimensions asto permit of the engagement of any one of the several links 16 of thechain therewith, the blocks of the links being received in theconcavities of the teeth. Normally, the block 12 lies in such positionthat the pins 1 1 will be received in the upper ends of the slots 13 andthe projection 15 will then assume a position between the full anddotted line positions illustrated in Fig. 1 of the drawings, or in otherwords, it will assume a posit-ion coincident with the longitudinal axisof the wrench.

Vhere the wrench is to be employed in turning a pipe to the right (as inFig. 1)

the chain is engaged at the proper one of its I links 16 with the lowerone of the teeth 17 in the same Fig. 1 oi? the drawings, it having beenfirst engaged about the pipe to be turned, as will be readilyunderstood. The stock of the wrench is then swung over to the right withthe lower jaw (in Fig. 1) in engagement with the pipe. This movement ofthe wrench stock will cause the lower one of the pins 14 to seat in theinner end of the lower slot in the block 12 and will further result in atilting or canting of this block so that the upper pin will be aboutmidway between the ends of the upper slot. This canting of the blockwill cause the chain to firmly bind about the pipe and itwill beunderstood that by providing two of the teeth 17 the wrench is adaptedfor engagement with pipes to be turned either to the right or the left.

lVhat is claimed is:

1. In a tool of the class described, a stock having spaced jaws, a blockdisposed between the aws, said block being formed with slots, pinsengaging through the jaws and through the slots, a chain connected atone end to the block, and a tooth upon the stock engageable by the linksof the chain interchangeably.

- 2. In a tool of the class described, a stock having spaced jaws, ablock mounted between the aws and formed with slots, pins engagedthrough the jaws and through the slots in the block, the said blockbeing formed with a lug projecting in a line between the slots, a toothupon the stock, and a chain connected to the lug of the block andengageable with the said tooth.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature 20 in the presence of two witnesses.

GEORGE WASHINGTON GRUVER.

lVitnesses H. R. Brosrom), FRANK KRIDLER.

